These masterpieces should be worth in the region of a half a billion pounds. Except they are fakes produced by David Henty, a convicted forger who produced them in the living room of his house by the seaside Brighton. Mr. Henty was exposed by The Telegraph a little over a year ago for selling his copies on eBay, duping hundreds, if not thousands, of the internet auction site’s customers in the process. But proving there’s no such thing as bad publicity, Mr. Henty has turned the notoriety to his advantage.